Bone Tissue Structure & Function Quiz and Flashcards

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Questions and Answers

What is the primary function of osteoclasts during bone remodeling?

To stimulate the parathyroid gland

To remove calcium from the blood

To build new bone

To break down existing bone (correct)

What type of bone replaces the callus during the bone remodeling process?

Spongy bone

Cartilage

Compact bone (correct)

Woven bone

Which of the following is a key function of spongy bone?

Transmitting nerve impulses

Storing calcium (correct)

Facilitating blood flow

Providing structural support

What is the primary function of compact bone?

Structural support Signup and view all the answers

How does parathyroid hormone (PTH) affect osteoclasts?

PTH increases the formation and activation of osteoclasts Signup and view all the answers

What is the primary function of calcitonin?

To decrease blood calcium levels when they are too high Signup and view all the answers

What is the main function of osteoclasts in the bone remodelling process?

Removing existing bone tissue Signup and view all the answers

Which type of bone tissue has a porous, spongy appearance with a network of interconnected spaces?

Cancellous bone Signup and view all the answers

What is the primary function of osteocytes in the bone tissue?

Maintaining the bone matrix Signup and view all the answers

Which type of bone tissue has a dense, solid structure with minimal open spaces?

Compact bone Signup and view all the answers

What is the primary role of osteoblasts in the bone remodelling process?

Forming new bone tissue Signup and view all the answers

What is the process of removing old bone and adding new bone called?

Bone Remodeling Signup and view all the answers

In which type of bone tissue are collagen fibers randomly oriented in many directions?

Woven bone Signup and view all the answers

What are the interconnecting rods or plates of bone in spongy bone tissue called?

Trabeculae Signup and view all the answers

Which type of environment do osteoclasts create for the breakdown of bone matrix?

Acidic environment Signup and view all the answers

How is Lamellar bone classified based on its organization?

According to the alignment of collagen fibers Signup and view all the answers

What is characteristic of compact bone structure in terms of blood supply?

'Supplied by Volkmann's canals Signup and view all the answers

Study Notes

Osteoclasts and Bone Remodeling

Osteoclasts play a crucial role in the remodeling process by resorbing (breaking down) old bone tissue.
They create an acidic environment that dissolves minerals and breaks down collagen in the bone matrix.

Types of Bone Involved in Remodeling

The callus, formed after a fracture, is initially replaced by woven bone during the remodeling process.
Spongy bone, also known as cancellous bone, has a porous, spongy appearance, containing a network of interconnected spaces.

Functions of Bone Types

Spongy bone provides structural support and houses bone marrow, playing a role in the production of blood cells.
Compact bone, characterized by its dense and solid structure with minimal open spaces, provides strength and stability to the skeleton.

Hormonal Regulation of Bone Remodeling

Parathyroid hormone (PTH) stimulates osteoclast activity, increasing calcium release from the bones into the bloodstream.
Calcitonin functions to inhibit osteoclast activity, thereby lowering blood calcium levels by promoting bone formation.

Other Key Functions and Structures

Osteocytes maintain bone tissue and act as mechanosensors to help regulate bone remodeling based on mechanical stress.
Osteoblasts are responsible for bone formation by synthesizing new bone matrix and facilitating mineralization.
Bone remodeling, which involves the removal of old bone and addition of new bone, is a continuous process that renews bone structure.

Bone Tissue Organization

Lamellar bone is classified based on its organization into layers or sheets, enhancing its structural integrity.
Collagen fibers in woven bone are oriented randomly, providing less strength compared to lamellar bone.

Spongy Bone Architecture

The interconnecting rods or plates in spongy bone tissue are called trabeculae, contributing to its lightweight yet strong nature.
Compact bone features a well-vascularized structure that allows efficient nutrient and waste exchange through a network of blood vessels.

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Description

Learn about the multistep process of osteoclasts in bone resorption and the classification of bone tissue as either woven or lamellar based on collagen fiber organization. Explore how osteoclasts access the bone matrix, create a sealed compartment for reabsorption, function in an acidic environment, and more.